The Optical Open Sight (OOS)
by John Andrew
The OOS is so simple that it’s practical to home build basic versions of it, and that’s been the go in my man cave for a while now. The following describes my efforts in putting the OOS idea to work for various forms of short range shooting as an alternative to a red-dot sight.
Popular red-dot sighting systems are usually an improvement on basic open sights but they sacrifice attributes that could be sadly missed. These could include, low cost, light weight, compactness, and suitability for use